diff --git a/lib/devmode.bash b/lib/devmode.bash
index 86823d0..0185c15 100755
--- a/lib/devmode.bash
+++ b/lib/devmode.bash
@@ -19,11 +19,6 @@ function assert_credentials {
   fi
 }
 
-function assert_system_mode {
-  [[ -L "$MIAOU_BASH_DIR" ]] && echo "already in develoment mode: $(realpath $MIAOU_BASH_DIR)" && return 3
-  true
-}
-
 function dev_mode {
   git clone "$GIT_URL"
   sudo rm "$MIAOU_BASH_DIR" -rf
@@ -37,13 +32,13 @@ function assert_reachable_target {
 
 # Main
 
+source "$MIAOU_BASH_DIR"/lib/functions.bash
 assert_normal_user
 assert_system_mode
 assert_credentials
 name=$(echo "$GIT_URL" | cut -d/ -f2)
 name="${name%.git}"
 target="$PWD/$name"
-source "$MIAOU_BASH_DIR"/lib/functions.bash
 _confirm_destructive "target directory will be: ${target}"
 assert_reachable_target
 dev_mode
diff --git a/lib/functions.bash b/lib/functions.bash
index 8c30f07..0d328f3 100644
--- a/lib/functions.bash
+++ b/lib/functions.bash
@@ -1,5 +1,16 @@
 ## library of useful functions, usually prefixed with '_'
 
+## ASSERT Functions
+
+function assert_root {
+  [[ "$UID" -ne 0 ]] && echo 'root privilege required' && return 1
+  true
+}
+
+function assert_system_mode {
+  [[ -L "$MIAOU_BASH_DIR" ]] && >&2 echo "ERROR: development mode: $(realpath $MIAOU_BASH_DIR)" && return 3
+  true
+}
 ## ===============
 ## ARRAY Functions
 ## ===============
diff --git a/lib/self-upgrade.bash b/lib/self-upgrade.bash
index d09802a..6dedc88 100755
--- a/lib/self-upgrade.bash
+++ b/lib/self-upgrade.bash
@@ -18,20 +18,26 @@ function bootstrap {
   fi
   echo "miaou-bash refreshed from: $MIAOU_BASH_DIR"
 }
-# MAIN
 
-[[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
-current=$(miaou-bash --version)
-latest=$("$MIAOU_BASH_DIR/tools/wget_semver" artcode miaou/miaou-bash)
-
-if [[ "$current" == "$latest" ]]; then
-  echo "up-to-date version: $current"
-else
-  # TODO: prevent refresh from development purpose
+function self_upgrade {
   rm -rf "$MIAOU_BASH_DIR"
   bootstrap
 
   . "$MIAOU_BASH_DIR/lib/init.bash"
   echo "miaou-bash successfully updated"
   miaou-bash --version
+}
+
+# MAIN
+
+source "$MIAOU_BASH_DIR"/lib/functions.bash
+assert_system_mode
+assert_root
+
+current=$(miaou-bash --version)
+latest=$("$MIAOU_BASH_DIR/tools/wget_semver" artcode miaou/miaou-bash)
+if [[ "$current" == "$latest" ]]; then
+  echo "up-to-date version: $current"
+else
+  self_upgrade 
 fi
diff --git a/lib/uninstall.bash b/lib/uninstall.bash
index 7493c35..b4513e5 100644
--- a/lib/uninstall.bash
+++ b/lib/uninstall.bash
@@ -1,13 +1,10 @@
 #!/usr/bin/env miaou-bash
 
-# MAIN
-[[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
+# Constants
 
-cd || exit
-
-source "$MIAOU_BASH_DIR"/lib/functions.bash
+# Functions
 
-if _confirm_destructive; then
+function uninstall {
   if [[ -f /etc/bash.bashrc.ORIGINAL ]]; then
     rm /etc/bash.bashrc
     mv /etc/bash.bashrc.ORIGINAL /etc/bash.bashrc
@@ -23,4 +20,16 @@ if _confirm_destructive; then
 
   unset MIAOU_BASH_DIR
   echo 'MIAOU-BASH fully uninstalled, restored from original'
+}
+
+# Main
+
+source "$MIAOU_BASH_DIR"/lib/functions.bash
+assert_system_mode
+assert_root
+cd || exit
+if _confirm_destructive; then
+  uninstall 
+else
+  >&2 echo canceled && builtin exit 1
 fi